/Engine/Source/Runtime/NetworkReplayStreaming/HttpNetworkReplayStreaming/Public/HttpNetworkReplayStreaming.h
FQueuedHttpRequestAddUserCustom event so that we can defer the need to knowing SessionName until we actually send it (which we should have it by then, since requests are executed in order)
class FQueuedHttpRequestAddUser : public [FQueuedHttpRequest](API\Runtime\HttpNetworkReplayStreaming\FQueuedHttpRequest)